If worn and activated during the first two Mastery Tests, the animation will trigger with an invisible melee weapons (as none is worn) and render the player unable to complete the test, as they cannot switch back to the weapon required to complete the test.

As of Update 10.1, you can get stuck in a blocking animation. Perform a melee strike to fix it. Using this mod together with Reflection against Corpus Turrets can crash the WARFRAME client.